Improvement in extension-chandeliers



.'r. T. BRUEN. y EXTENSION-CHANDELIER.

Patented May 29,1877.

No.191,399.v

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N.FETERS. FHOTO-LITHOGRAPNER, WASHINGTON. ,D. C.

JOHN T. BRUEN, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN EXTENSION-CHANDELIERS.

Specification forming part of Letters Patent No. 191,399, dated May 29,1877; application filed February 22, 1877.

To all whom it may concern Be it knownthat I, JOHN T. BRUEN, of the cityof Brooklyn, in the county of Kings and State ofNew York, have inventedan Improvement in Extension-Chandeliers; and I hereby declare that thefollowing is a full, clear, and exact description of the same, referenceheilig had to the accompanying drawing, which forms a part of thisspecification.

My invention has for its object to secure a more convenient and reliablemeans for raising or lowering and holding extension-charideliers at anydesired elevation.

The invention consists, partly, in the combination, with the movableportion of a chandelier and its iixed suspending-tube, of an internalscrew and nut ot' rapid pitch, one turning in or upon the other solelyby end thrust, and an automatic stop device operating to prevent suchturning of the screw or nut, and thereby to stop the descent of thechandelier, and holdv through the suspending-tube made on the line m a:in Fig. 2, and a cross-section through the supporting-screw placed inthe interior of said tube in relation therewith, as when in use.

A represents the supporting-screw or threaded rod, of rapid pitch,which, when uncontined, turns freely by end thrust in the suspendingtubeB; or the screw may be rigidly fixed to the chandelier, and the nut mayturn freely thereon.

Various ways of arresting the turning of said screw or nut may beemployed, and I hereinafter describe a stop device for holding the screwfrom turning; but I d0 not confine myself to the exact stop devicedescribed.

Said screw is preferably made of four wires twisted over each other insuch manner that the exterior parts of the wires form threads bottom, orin any suitable manner, to the hollow cylinder d, the said reducer cbeing screwed into the upper part ot' said ,hollowcylinder, and heldfrom unscrewing by a pin,

e, passed through the said cylinder, reducer,

and screw. The said cylinder d is fitted into the box or oase F, andconfined therein by the reducer c', so that, when unobstructed, it mayfreely revolve in said box or case, as hereinafter described. The saidbox or case F has formed on its lower end a knob, G. In the bottom ofthe hollow cylinder d is formeda pyramidal or conical seat, h, for apyramidal or conical stop, i, between which and the lower end of thescrew A is placed, over the stem i ot' said stop, a spring, k, which,when left free to expand, constantly forces said stop down into the seatIt with a force that prevents the screw A audits attached cylinder dfrom turning.

The stop i is provided with a stem, l, which passes out through thebottom of the box or case F, and through the knob G, and has attached toits squared lower end a button, m, held by the screw n', and titted intoa recess, n, in the bottom of the said knob, the said stem l being longenough to allow said button to move vertically in the said recess. Saidbutton and stop t, attached together as described, are prevented fromturning relatively to the box F and the knob Gr by a pin, p, insertedthrough the button m, and sliding iu a hole, r, formed in the said knob.Or the button m and the recess n may be polygonal; or other means forpreventing the button from turning may be employed.

It will now be seen that whenever the stop t' is forced into its seat 7Lby the spring 7c, the cylinder d, attached to the bottom of said screw,will be held from turning, and through the stemt of said stop the buttonm and the pin p are also held from turning relatively to the box F,which is attached'to the tube 'l by the reducer c. The bracket center orboss S and ornamental parts of the chandelier are slipped over the tubeT, and firmly held between the box F and the shoulder formed by thejunction of the tubes T and T' when the tube T is screwed into thereducer c'. The upper end ofthe tube T is rigidly attached to the largertube T', receiving within it the suspending-tube B, saidsuspending-tube, when in use, being attached rigidly by the canopy U, orin any other manner, to the ceiling of a room or other permanentsupport.

The suspending-tube B forms at its lower end a novel nut constructed byinserting from the outside two (more or less) pieces, t, of steel wire,of a thickness to suit the open ways or spaces between the wires orthreads of the screw A, and longitudinally so inclined and curved as tomatch its pitch and diameter. This is done by cutting inclined groovesinto the said tube, and when the wires t are laid therein, resting uponthe screw inside, then the ends are closed in and clinched, leaving themiddle part free to allow them to adopt themselves to the open waysbetween the wires or threads ot' the screw.

But, as aforesaid, the peculiar construction ot' the said screw andtubular nut are not parts of the present invention. A screw of rapidpitch and a female threaded tube'or nut fitting said screw'and formed inany other manner may be used.

The tube T', which receives within it the tube B, has a longitudinalslot, a, formed therein, into which is fitted the projection b, formedon the exterior of the lower part of the tube B. This constructionprevents the tube T', its attached tube T, and box F from turningrelatively to the tube B, which, as aforesaid, is rigidly attached to asuitable support.

The top of the tube T' is provided with a stiffening-nut, f, screwedonto said tube, and which serves to hold whatever ornaments may beslipped over the tube between it and the ornaments immediately below theshoulder formed by the junction of the tubes T and T', and the upper endof the slot a in said tube, through which the projection b on the tube Bis slipped into said slot, is closed by the inner end of a screw, j,passed through the side of the nutf.

It will be seen that the tube B, tubes T and l T', the box or case F7the button m, and stop i are prevented by the projection b from turningon their vertical axis when the tube B is rigidly attached to itssupport, but that the tube T' may slide vertically over the tube Bwhenever the screw A is not held from turning. Therefore, whenever theentire apparatus is left to itself the' spring k forces the stop i downinto its seat and holds the said screw from turning, which, by itsengagement with the nut-tube B, holds the chandelier at any desiredelevation to which it maybe adj usted.

To release the screw and permit it to turn, the fingers are placed uponthe upper side of the knob G of the box or case F, and the thumb ispressed upward against the button m with suiicient force to overcome theresistance of the spring k, which holds the stop engaged with the seath. The screw being then free to turn in the tube B, which on account ofits rapid pitch it does very easily by end thrust, the chandelier may,by the hand which grasps the knob G, be easily pushed up or drawn downto the desired elevation, at which point the release of the button mfrom the pressure of the thumb allows-the spring k to instantaneouslypress the stop t' into its seat, and the screw, thus held from furtherturning, holds the chandelier at the desired position. But instead oflifting the stop t' from below by the button m and stem ll, it may beraised by any other suitable device for actuating said stop from above.

The screw A, by its friction,which, when the stop t isy conical, may beregulated by the pressure of the thumb on the button m, acts to retardthe descent of the chandelier when the same is lowered; but to renderthe adjustment more easy, both for raising and lowering, springs E,connecting the chandelier with the canopy U or with its permanentsupport, may be employed to assist the screw in supporting the weight ofthe chandelier, and in controlling the descent of the same.

I claiml. The combination, with the movable portion of a chandelier andits fixed suspendingtube, of an internal screw and nut, the one turningupon the other by end thrust, and an automatic stop device operating toprevent such turning ofthe screw or nut, and thereby to stop the descentof the chandelier, substantially as described.

2. The combination of the internally-threaded suspending-tube B,provided with a projection, b, the slotted sliding tube T attached tothe chandelier, the box F, the screw or threaded rod A, the cylinder dattached to said screw and containing the seat h, the stop t', thespring 7c which acts upon said stop, and the button m, substantially asand for the purpose specified.

3. The combination of the supporting-screw A, the suspending-tube B, andsprings E, substantially as and for the purpose specified.

JNO. T. BRUEN. Witnesses:

BENJAMIN W. HOFFMAN, FRED. HAYNES.

